Casa Bardicci Window

For this space over the front gate...

There once was a window like this...

I have worked up a design for something new based on these references...

Italian profiles

Italian ceramics

Bardicci Coins

Italian painting.
I particularly liked this face for the Duke. I found it on Pinterest but it was sketchily referenced:
  Conti de' Bernardino Portrait of Gian Nicolò Trivulzio (ca1505)

Design rendering

Glass calculation